Two listings have appeared online that point to a Dead Rising Collection, although they seem to point towards an Xbox 360-only release.
The listings state that the collection will include:
Dead Rising 2
Dead Rising 2: Off the Record
2 Premium DLC packs of Case West and Case Zero
Most notable is the price. Amazon UK lists Dead Rising 2 new for £21. Granted, that is high, but the Collection is around £25 on both listings. The listings, which have since been removed, can be viewed below: